Krita and ComfyUI Plugin

How to Use Krita With Stable Diffusion RunDiffusion (Updated 2025 Guide)

Krita is one of the most popular open-source digital art programs, offering a powerful and flexible drawing environment. With the AI Diffusion plugin, you can connect Krita directly to a cloud-hosted Stable Diffusion server using RunDiffusion’s ComfyUI API—no local GPU or complex setup required.
This guide walks you step-by-step through installing the plugin, launching a ComfyUI API session on RunDiffusion, and connecting the two inside Krita.

If you're new to ComfyUI or need additional help, the following internal resources may be useful

Install the Latest Version of Krita

Make sure you are running the most recent version of Krita 5.2.13 or newer.
Download from the official site:

Digital Painting. Creative Freedom.

Krita is a professional FREE and open source painting program. It is made by artists that want to see affordable art tools for everyone.

Krita

Updating ensures full compatibility with the AI Image Generation plugin.

Download the Krita AI Diffusion Plugin

Download the latest plugin release from the official GitHub:

Release Version 1.43.0 · Acly/krita-ai-diffusion

Download krita_ai_diffusion-1.43.0.zip Z-Image (experimental) Z-Image is a new diffusion model which produces convincing photorealistic images out of the box. Its modest size (larger than SDXL but…

GitHubAcly

Save the .zip file—you’ll import it into Krita next.

Install the Plugin in Krita

Open Krita
Go to Tools → Scripts → Import Python Plugin From File
Select the downloaded plugin zip file

Open ComfyUI in RunDiffusion

Log in to RunDiffusion: https://app.rundiffusion.com/login
In the left sidebar, click Open Source Apps
Select ComfyUI and click Select

Configure and Launch ComfyUI in API Mode

On the ComfyUI Setup Session. Choose your preferred server size.
Scroll down and toggle API Mode ON
Click Launch

Copy the ComfyUI API URL

Look in the top right corner|
Click the API icon
Click Copy to copy your unique API URL

Open an Image in Krita

Return to Krita and Open an Image File with 512x512.

Enable the AI Image Generation Docker

Click on Settings then Dockers then AI Image Generation.

Connect Krita to RunDiffusion’s API

In the AI Image Generation docker, click the gear icon (Configure)
Go to the Connection tab
Select Custom Server
Paste the API URL you copied from ComfyUI
Click Connect

Troubleshooting Missing Nodes.

If you get an error that Comfyui-tooling-nodes are missing. Go to the Custom node manager and click Try Update. Then restart with the server manager.

Examples

An example using Flux in Krita.
Prompt: A drone view of an apartment complex with a pool.